beagleboard-test-image: added ramdisk
beagleboard-test-image: added ramdisk

Simply adding 'ext2.gz' to the IMAGE_FSTYPES to produce a default sized
ramdisk image whenever this image is built.

Uses 'IMAGE_FSTYPES +=' syntax to add a compressed ext2 image to use as
a ramdisk for BeagleBoard validation.  No space is required in the
string per link provided by Paul Menzel. [1]

[1] http://docs.openembedded.org/usermanual/usermanual.html

Signed-off-by: Koen Kooi <42e3d96910f922bdd7dd1805fe3f8aff634f391d@openembedded.org>

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